/*
** $Id: lmem.c,v 1.70.1.1 2007/12/27 13:02:25 roberto Exp $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/


#include <stddef.h>

#define lmem_c
#define LUA_CORE

#include "lua.h"

#include "lmem.h"
#include "lobject.h"
#include "lstate.h"


/*
** About the realloc function:
** void * frealloc (void *ud, void *ptr, size_t osize, size_t nsize);
** (`osize' is the old size, `nsize' is the new size)
**
** Lua ensures that (ptr == NULL) iff (osize == 0).
**
** * frealloc(ud, NULL, 0, x) creates a new block of size `x'
**
** * frealloc(ud, p, x, 0) frees the block `p'
** (in this specific case, frealloc must return NULL).
** particularly, frealloc(ud, NULL, 0, 0) does nothing
** (which is equivalent to free(NULL) in ANSI C)
**
** frealloc returns NULL if it cannot create or reallocate the area
** (any reallocation to an equal or smaller size cannot fail!)
*/


void *luaM_toobig(lua_State *L) {
	// TODO luaG_runerror(L, "memory allocation error: block too big");
	return NULL;	/* to avoid warnings */
}


/*
** generic allocation routine.
*/
void *luaM_realloc_(lua_State *L, void *block, size_t osize, size_t nsize) {
	global_State *g = G(L);
	lua_assert((osize == 0) == (block == 0));
	block = (*g->frealloc)(g->ud, block, osize, nsize);
	if (block == NULL && nsize > 0)
		// TODO luaD_throw(L, LUA_ERRMEM);
		// TODO delelte return NULL
		return NULL;
	lua_assert((nsize == 0) == (block == NULL));
	g->totalbytes = (g->totalbytes - osize) + nsize;
	return block;
}
